Selective electrodes for silver based on polymeric membranes containing calix[4]arene derivatives

Silver ion-selective electrodes were prepared with polymeric membranes base d on two calix[4]arene derivatives functionalized by two hydroxy and two be nzothiazolylthioethoxy groups. The electrodes all gave a good Nernstian res ponse of 58 mV decade(-1) for silver in the activity range 5 x 10(-6)-10(-1 ) M, the limits of detection reached 10(-5.8) M and exhibited high selectiv ity towards alkali, alkaline earth and some transition metal ions. The elec trode was used as indicator electrode in titrations of Ag+ with Cl- ion.